Study finds socially tolerant monkeys have better impulse control
), proposed a classification of social style along a four-grade scale based, among other criteria, on patterns of aggression and reconciliation; from despotic and nepotistic style of social relationships to a more tolerant style with more open relationships.
Hence, the aim of this study was to explore the influence of social tolerance degrees on inhibitory control skills using a recently developed and validated battery of tasks . Our main hypothesis is that the more tolerant species, arguably living in more complex social environments, will outperform the less tolerant species in the main components of inhibitory control.
In the MRC-CFM, 21 rhesus macaques were housed in 14 different social groups with an average of 12 individuals per group. All animals were living in mixed groups consisting of one dominant male and several females, infants and juveniles . Each group had access to an indoor free-roaming room and an adjacent caged area , with a minimum total space of 3.5 mper breeding animal in the largest groups. All rooms were temperature controlled with humidity at 55% ± 10.
Table 1 Description of the sex, the age and the ranking of the subject rhesus, long-tailed and Tonkean macaquesIn the CdP, all macaques were raised in social groups and had access to an indoor and outdoor area. Seven rhesus macaques were raised in groups from 3 to 5 individuals consisting of one dominant male and several females and younglings. They lived in cages, measuring 16.5 to 33 mfor the outdoor area. Cages were enriched with climbing devices.
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